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TeleVue AP 127/680 Astrograph OTA Specs
| Brand | TeleVue Optics |
| Full Model Code | TeleVue AP 127/680 NP127fli Nagler-Petzval Astrograph Apochromatic Refractor Optical Tube Assembly |
| Country of Origin | United States of America (Manufactured in collaboration with Finger Lakes Instrumentation) |
| Optical Design | Apochromatic Astrograph (5-Element in 3-Group Nagler-Petzval Configuration with integrated Large Field Corrector lens cell) |
| Aperture | 127 mm (5.00 inches) |
| Focal Length | 680 mm |
| Focal Ratio | f/5.35 |
| Optical Coatings | Proprietary TeleVue Ultra-High Transmission Multi-Coated Layer Matrix on all air-to-glass surfaces |
| Glass Material | Premium Extra-Low Dispersion Optical Glass sets paired with matched internal corrective elements for flat field imaging |
| Secondary Mirror Obstruction | 0 mm (Unobstructed Optical Path Setup) |
| Secondary Mirror Obstruction by Diameter | 0% |
| Secondary Mirror Obstruction by Area | 0% |
| Resolving Power | 0.91 Arcseconds (Dawes), 1.09 Arcseconds (Rayleigh) |
| Limiting Visual Magnitude | 12.3 |
| Highest Useful Magnification | 254x |
| Lowest Useful Magnification | 18x |
| Optical Tube Material | Premium Texture-Coated Aluminum Main Tube with high-efficiency internal light-trapping flocking layers |
| Focuser Style & Mechanism | Purpose-built to integrate Finger Lakes Instrumentation Atlas heavy-duty digital focuser via a Zero Tilt Adapter framework |
| Mirror Lock Mechanism | No (Fixed rigid mechanical body eliminating alignment shifting during long-exposure capture) |
| Optical Tube Dimensions | 135 mm x 909 mm (Tube Outer Diameter x Core Operating Length excluding external FLI hardware) |
| Optical Tube Weight | 7.12 kg (15.70 lbs) (Bare Optical Tube Assembly framework configuration) |
| Mount Attachment Type | Heavy-Duty Astrograph Mounting Rings featuring a 3-point structural securement system |
| Finder Scope Specification | Accessory rail system channels designed for custom guider or specialized auxiliary bracket attachment |
| Included Accessories | 127mm Astrograph Objective Unit, Built-in TeleVue Large Field Corrector, Image Plane Tilt Correction System, Screw-on Metal Lens Cover, Mounting Rings, Hard-Shell Carry Case |
| Standard Warranty | 5-Year Manufacturer Warranty |
| Application | Turn-key professional medium-to-large format sensor astrophotography, delivering a 4.3-degree flat field optimized for specialized high-payload filter wheel and camera trains. |
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